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Trane XR14 or XR15?

Hi newbie here, I need to buy an outdoor unit for my 2100 sq ft home in Savannah Ga. I have it narrowed down to 2 Trane systems. The first is a Trane XR 15 3.5ton system with a 15 seer rating. The other is a Trane XB 14, 4ton system with a 15 seer rating. Both units are priced the same and I can't decide if I should go with the 3.5 ton XR15 or the 4 ton XB14 ? I have a variable speed hyperion indoor unit (air handler I think its called) installed already, and my home is Spray Foam insulated, no Fiberglass insulation (if that helps) I just want to know what will be the best "bang" for my buck, and what are the major differences, which unit can best handle Hot Georgia weather and which system will be cheaper to operate? etc. Thank-you in advance for helping me.

Hi newbie here, I need to buy an outdoor unit for my 2100 sq ft home in Savannah Ga. I have it narrowed down to 2 Trane systems. The first is a Trane XR 15 3.5ton system with a 15 seer rating. The other is a Trane XB 14, 4ton system with a 15 seer rating. Both units are priced the same and I can't decide if I should go with the 3.5 ton XR15 or the 4 ton XB14 ? I have a variable speed hyperion indoor unit (air handler I think its called) installed already, and my home is Spray Foam insulated, no Fiberglass insulation (if that helps) I just want to know what will be the best "bang" for my buck, and what are the major differences, which unit can best handle Hot Georgia weather and which system will be cheaper to operate? etc. Thank-you in advance for helping me.

Foamed house and 2100 sq ft equals Manual J8 and and probably less than 3 tons

that's just it, the contractor says there's no difference, I just get a half ton more with the XB, and that leads me to believe the XB14 isn't as good as the XR15, but I really don't know, I'm just guessing. Also the thermostat he is installing has really good humidity control according to him, but I need more opinions, thanks.

Thank-you everybody for your input. I guess the XB 4 ton is out, being it is oversized. But now I'm not sure if I should get the 3.5 ton XR either. I have scheduled a load test to be done today, I'll let ya'll know the results soon. However, I still need to know what the differences are between a Trane XB and a Trane XR series?

Get it sized right. Sizing can be all over the place. I can cool my whole 2 story 3200sqft home with 4 tons and it's not spray foamed in the walls... and the design conditions are only 1F cooler (WB & DB) than Savannah... our summer is just shorter and we have a real winter. If a retrofitted spray foam in the walls it would probably be around 3 tons... or 1.5 tons on each floor.

XB is the lower end almost builder grade. I believe it's the same compressor, but the XR has a more rugged enclosure and a sound blanket so it's a little quieter. I'd go with the XR if I was looking at Trane.

I personally prefer the contractor I use and he sells Carrier. I like their equipment too. If he sold Trane, I'd have Trane in my house.

Thank-you everybody for your input. I guess the XB 4 ton is out, being it is oversized. But now I'm not sure if I should get the 3.5 ton XR either. I have scheduled a load test to be done today, I'll let ya'll know the results soon. However, I still need to know what the differences are between a Trane XB and a Trane XR series?

The XB 13 & 14 compared to the XR 13 & 14. They both offer 10 year parts & compressor warranty. The color of the condenser/heat pump will be a different and the sound blanket is on the XR so is a little quieter. All in all the same system & warranty. We install a lot of XB14 systems do to good seer rating when matched with high eff. Coil & furnace.

Thanks Duckman! I talked to my installer yesterday, he said the reason he gave me a higher ton system is so that the unit will properly take out humidity, and with the 100 degree plus days we've been getting the unit will be able to cool down to the temp I want (my current unit at my rental home won't go lower than 85 degrees no matter what I set it to, and it runs all day long) does all this sound right?